During phloem loading, sugar is moved in the form of sucrose from mesophyll cell to phloem by –

Options

A. Passive transport
B. Active transport
C. Facilitated diffusion
D. Osmosis

Answer

To answer the question regarding how sugar is moved in the form of sucrose from mesophyll cells to phloem during phloem loading, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Phloem Loading**: Phloem loading is the process by which sugars, primarily in the form of sucrose, are transported from the mesophyll cells (where photosynthesis occurs) into the phloem (the vascular tissue responsible for transporting nutrients).

2. **Identifying the Form of Sugar**: The sugar that is loaded into the phloem is specifically sucrose. This is important because it indicates the type of transport mechanism that may be involved.

3. **Transport Mechanism**: The movement of sucrose from mesophyll cells to phloem is not a passive process. It requires energy to move the sugar against a concentration gradient.

4. **Active Transport**: The process of moving sucrose into the phloem involves active transport. This means that energy, usually in the form of ATP, is utilized to facilitate the movement of sucrose from an area of lower concentration (mesophyll cells) to an area of higher concentration (phloem).

5. **Conclusion**: Therefore, the correct answer to the question is that during phloem loading, sugar is moved in the form of sucrose from mesophyll cells to phloem by **active transport**.

### Final Answer:
During phloem loading, sugar is moved in the form of sucrose from mesophyll cells to phloem by **active transport**.

---